This VCO with discrete components was found documentation from the 1980s. The central frequency with the indicated components is 8 kHz. A BC548 can be used for Q1.
This circuit was found in a 1967s Motorola documentation. The circuit regulates the voltage of an...
This small audio amplifier uses germanium transistors and a 12 V supply. The circuit is from a...
This circuit was found in an Argentine Radio Escuela Gráfica magazine published in the 1970s. The...